Published for opposition refers to the period before a trademark can officially be registered. During this time, companies and the public can object to the trademark's registration.

What happens when a trademark is published for opposition?

A trademark is published for opposition after the USPTO determines that your trademark application complies with all applicable laws, rules, and regulations. ... If the examining attorney concludes that your application meets all legal requirements, it will approve your trademark for publication.

What happens after published for opposition?

What happens after a trademark is published for opposition? If no oppositions or extensions of time are filed, then a use-based application will proceed to registration. Keep in mind that third parties who fail to oppose your application may still file a cancellation after your trademark is registered.